߈̴, spelled like Derf, is an imaginary number between 5 and 6. It was created by Carly. In the episode iTwins, Carly sees hidden camera footage of Chuck beating up Spencer, her older brother. To get revenge on Chuck, she makes up the number ߈̴ and tricks him into thinking it's part of the new International Math Laws that were recently passed by the U.N. Chuck …